package com.example.demo.security.util;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

public class JwtInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map = new HashMap<>();
        //获取请求头中令牌
        String token = request.getHeader("Authorization");
        try {
            if(token!=null){
                //验证令牌
                JwtUtils.verifyToken(token);
                //验证成功，放行请求
                return true;
            }
        } catch (SignatureVerificationException e) {
            e.printStackTrace();
            map.put("msg", "无效签名!");
        } catch (TokenExpiredException e) {
            e.printStackTrace();
            map.put("msg", "token过期!");
        } catch (AlgorithmMismatchException e) {
            e.printStackTrace();
            map.put("msg", "token算法不一致!");
        } catch (Exception e) {
            e.printStackTrace();
            map.put("msg", "token无效!!");
        }
        //设置状态
        map.put("state", false);
        //将map转为json
        String json = new ObjectMapper().writeValueAsString(map);
        // 相应json数据
        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().println(json);
        return false;
    }
}

